Hammer and renewable tip for hammer mills



Nov. 28, 1950 E. c. ANDERSON HAMMER AND RENEWABLE TIP FOR HAMMER MILLS 2 Sheets-Sheet 1 Filed Sept. 2, 1948 Madman DERSON Nov. 28, 1950 Patented Nov. 28, 1950 STATS QFFHCE HAMMER AND RENEWABLE TIP FOR HAMMER MILLS Application September 2, 1948, Serial No. 47,501

Claims.

This invention relates to hammer mill hammers of the two-part type, comprising a shank and a separate tip which is designed to be removed when worn and to be replaced by a new or unworn tip, and has generally in View to provide a hammer mill hammer of this type embodying an improved interlocking connection between the tip and the shank, whereby the tip normally is retained firmly, positively and securely upon the shank and yet is readily removable and replaceable whenever desired while the shank remains operatively mounted in the mill. More particularly, a special and important object of the invention is to provide a hammer mill hammer of the type mentioned in which the interlocking connection between the tip and the shank of the hammer is so designed that blows struck by the hammer tend to maintain and to intensify a firm, rigid assembly of the tip with the shank.

With the foregoing and other objects in view, which will become more fully apparent as the nature of the invention is better understood, the same consists in a hammer mill hammer of the type mentioned embodying the novel features of construction, combination and arrangement of parts as are illustrated by way of example in the accompanying drawings and as will be hereinafter more fully described and claimed.

In the accompanying drawings, wherein like characters of reference denote corresponding parts in the different views:

Figure 1 is a side elevation of a hammer mill hammer constructed in accordance with the invention.

Figure 2 is a section on the line 2-2 of Figure 1.

Figure 3 is a section on the line 3-3 of Figure 1.

Figure 4 is a perspective view of the outer end portion of the shank of the hammer; and

Figure 5 is a perspective View of the hammer tip.

Referring to the drawings in detail, A designates, generally, the shank of the present hammer and B designates, generally, the hammer tip which is separate from said shank and removably, replaceably mounted thereon for the reasons aforementioned.

In accordance with the invention, the outer end portion of the shank A has formed therein and extending preferably entirely thereacross and opening through the front thereof a recess l0. Also, in accordance with the invention, the outer end portion of the shank A isprovided, outwardly of the .recess ID, with a forwardly projecting tongue H which likewise extends preferably entirely across said shank. Further, in accordance with the invention, the recess it is of rearwardly tapering form and the tongue II is of rearwardly flaring form. In addition, the outer end face of the shank A preferably is inclined rearwardly and outwardly, and the outer end portion of said shank has projecting laterally from each side thereof, adjacent to its rear edge, a lug l2 which preferably is of rearwardly flaring form.

The tip B is composed of a bottom or outer end wall it, a front wall I l and side walls [5, which are spaced apart to accommodate between them the outer end portion of the shank A. As best shown in Figure 5 of the drawings, the tip B is open at its inner end and at its rear so that it is engageable with the outer end portion of the shank A by rearward movement relative to the latter.

The inner face of the bottom or outer end wall l3 of the tip B is rearwardly and outwardly ininclined corresponding substantially to the rearward and outward inclination of the outer end of the shank A so as to engage the latter more or less throughout its length. On the other hand,

the outer face of said bottom wall I3 is arcuately curved from front to rear about an axis located in, or in a continuation of, the transverse, central plane of the shank A, with the result that said bottom wall is of rearwardly tapering form and is composed of a greater amount of metal at its front end, where maximum wear of the tip occurs, than at its rear end where a lesser amount of wear occurs.

The front wall Hi of the tip B has formed therein and opening through the rear thereof a rearwardly flaring recess Hi.- In addition, said front wall is provided, inwardly of said recess it, with a rearwardly projecting, rearwardly tapered lug ii.

The recess It is designed to accommodate the tongue I! of the shank A and the recess ID of said shank is designed to accommodate the tongue ll of the tip B, and said tongues and recesses are of sizes and shapes so that said tongues have wedging engagement in said recesses as a result of rearward movement of the tip B to its operative or applied position relative to the shank A.

Formed in the side walls I5, l5 of the tip B are recesses it, Hi which open through the rear edges of said side walls and which are located and are of sizes and shapes to receive the lugs i2 when the tip B is operatively applied to the shank A. Thus, when said tip B is operatively applied to the shank A, the wedging engagement of the tip B is operatively applied to said shank, is'

an opening 20.

A tapered pin 2| is insert'able'tl'iioughitdeopen ings l9 and when the up B is op'eratively applied to the shank A and is operable, upon being driven through said openings to, urge said til rearwardly relative to said, shank to cause the tongue and recess formations l'll8 and li' '5' and the lug and recess formations 2-i8 to we'dgingly cooperate to fasten said tip tightly upon said shank. llioreovensaid pin- 2} obviously is effective to prevent forward movement of the tip 13' relative to the shank A and hence is operable to retain said tip securely upon said shank. v

Formed in the outer faces of the tip side walls I5, I 5 adjacent to the openings l9, it] are recesses 22, one" of which is adapted to accommodate a head 23 at one end of the pin 25 and the other of which is adapted to have a portion 24 of reduced thickness at the other end of said pin bent into the same, whereby accidental reinovalpf said pinis prevented and whereby the ends of said pin do not project beyond the outer faces oftl ie sidewallslfi, l5. 7

When it is desired to remove a worn tip 3, the bent end portion Etof the pin 2| is straightened and said pin isremoved. TheIworntip B then may readily be moved forwardly relative to he sha k Mo d en it f om an ha a a rleeement mevr sli y b r ied ing'the'same rearwardlirelativle to the shankand s r ns h me ea i BJ- .AS W b a aren r m digfl e 's he Pres n ti is gdi v vablee d r al s: a le wi h e the 11Z n a n o era i e? mwn' fintm m gb w s ruck-b aid t p e d 1 we he. sw ater? mlv evin. aid

shank; said tip isipos'iti'vely interlocked withjsai'gi sh m? nd in d s, a maid w ul amete Where greatest wear occurs, and the pin Zj is not es l m fuT I O c i ns. o t e a me s t t. ere; s L tle. o no likelihoodof loss of the tip fromtheshank dueto fatigue ofsaid pin. Fr m th ore o r ri a 9 3 i r d iii connection with the accompanying drawings, it is believed that the construction of the present hammer will be clearly understood and its ad; vantages appreciated, It is desired to point out, however, that while onlya single, specific structural embodiment of the invention has heen illusat d n d ribe sa isr edi ease f. spe y d f erent tru u a .eg g zneni within its spirit 'an'dscope as defined in the appended claims.

I claim:

I mer mill hammer comprisinga shank, a tip separate from'said'shank mounted upon the outer end portion of the latter, said tip-ineluding a frdnt wall overlying the" front face of the outer end portion of said shank; albottom' wall overlying the outer endof said shank. and side walls overlying the side faces) of the outer end portion of said shank, the front part of the outer end portion of said shank and the front wall of said tip having tongue and recess Wedge formations tightly engageable with each other by rearward movement of the tip relative to the shank to secure the tip firmly upon the shank, the sides of said shank and the side walls of said tip having lug and recess wedge formations also tightly engageable with each other by rearward movement of the tip relative to the shank to assist in securing the tip firmly upon the shank, there being clearance spaces between adjacent ends of said wedge formations to permit said tip to move rearwardlyrelative to said shank to compensate forwwea r upon said wedge formations, and means for securing said tip against forward movee t l iiy to said-s 2'. Ahalm'rn'er mill hammer as set forth in claim 1.wherein. the shank and the side walls of the tip have alined transverse openings, and wherein the means r r -seg ringt e pa a s-t. orw mentrelative to the shankocomprisesa tapered pin extending through said op'eningsand effective upon driving of the same to urge the tip rearwardly relative to the shank to tighten said tip relative to said shank. v a p 3. A hammer mill hammer as set forth in claim 1 in which the lug and recess wedge formations comprise forwardly tapered lugs projecting from the sides of the shank and forwardly taperedre cessesin the side walls of the tip opening through the rear edges of said side walls. I I

4. A hammer rnill hammer comprising a shank, a tip separate from said shank, mounteddi'pgn the outer end portion of the latter,- said ep meluding a front wall overlying the frontfacepf the outer end portion of said shank, ajbottom wall overlying the outer end of said shank, and side walls overlying the side faces of theouter end portion of said shank, the front part oflthe' outer end portion of said shank having a re a'rwardly tapered recess therein and-a forwardly tapered tongue projectingforwardlytherefrom, the front wall ofsaid tip having a forwardly taperedrecess therein and a rearwardly tapered tongue projecting rearwardly therefrom, said tongues being disposed in said recesses, respectively, and having wedging cooperation therewith responsive to rearward movement of said tip relative to said shank to secure said tip firmly upon said shank, there being clearance spaces between adjacent ends of said tongues and'said recesses to. permit said tip tomove rearwardly relative to said shank to compensate for wear upon thecoacting wedg- 7 ing surfaces of said tongues and said recesses,

the-side walls of said tip having therein and opening through their rear edges forwardly tapered recesses, forwardly tapered. lugs projecting from thesides of the outer end portionof said shank and-disposed-inithe recesses in said side walls and having wedging cooperation there;- with responsive to rearwardmovement of said tiprelativefto'said shank to assistin securing saidtip firmly uponsaid shank, there being clear;- ance' spacesbetweenthe adjacent ends of said lugs and said side wall'recesses to permit, .,tl'1e tip to move rearwardly relative. tqtheshankito compensate for wear upon the coa'c'ting wedging surfaces-ofsaidlug's and said side wall: recesses, and means for securing saidtip against forward movement ,relative' to said shank l 5. A ham mer mill hammer tip to bereplaceably mounted on the outer end of a hammer mil1.ham mer shank, saidjtip including a front wall toover} lie the front face of the outer end portion of 5 the shank, and side walls to overlie the side faces of the shank, the front wall of said tip having at the rear thereof a wedge-shaped formation for wedging cooperation with a companion wedgeshaped formation of the shank to secure the tip firmly upon the shank responsive to rearward movement of the tip relative to the shank, the side walls of said tip having forwardly tapered recesses therein opening through the rear edges of said side walls and extending substantial distances into said side walls for wedging cooperation with lugs projecting from the sides of the shank to assist in securing the tip firmly upon the shank responsive to rearward movement of the tip relative to the shank.

EDMUND C. ANDERSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 15 Number 

